Handlers that serve images results in 500

[asselstine]

A 500 results when creating a handler that writes an image buffer to the output:

exports.handler = function (event, context, callback) {

var outputBuffer = // ... image buffer stuff

var response = {
    statusCode: 200,
    headers: {'Content-Type' : 'image/png'},
    body: outputBuffer.toString('base64'),
    isBase64Encoded: true
}

callback(null, response)

}

[nolessafool]

(note that this works in production when run on AWS - just breaks in netlify-lambda!)

[swyxio]

i have no idea how to fix this.. just gonna say help wanted / PR welcome

[asselstine]

Try a Gitcoin bounty :)

[8eecf0d2]

@asselstine if you need a patch, #68 seems to have fixed this but is still waiting on review...

[swyxio]

hey @asselstine or @8eecf0d2 i need some help to understand this... is there a super simple small example you can spin up so i can try this out and/or test the PR against? thank you very much

[8eecf0d2]

@sw-yx Below is the snippet I tested, the base-64 package netlify-lambda is using seems to be incorrectly decoding the string - not sure if this is an issue with the package or with usage.

import * as fs from "fs";

export const handler = async (request, context, callback) => {
  const pngBuffer = fs.readFileSync(path.join(process.cwd(), "image.png"));
  
  return {
    statusCode: 200,
    body: pngBuffer.toString("base64"),
    isBase64Encoded: true,
  }
}

[swyxio]

will get to this soon

[swyxio]

woo hoo it worked!

you seriously rock @8eecf0d2. wondering if i can convince the other Netlify folk to just give you commit rights...

[swyxio]

@asselstine please retry.. with netlify-lambda v1.0.3 and something like this as a lambda function:

import * as fs from 'fs'
import path from 'path'

export const handler = async (request, context, callback) => {
  const path2 = path.join(process.cwd(), 'image.png')
  const pngBuffer = fs.readFileSync(path2)

  return {
    statusCode: 200,
    headers: { 'Content-Type': 'image/png' },
    body: pngBuffer.toString('base64'),
    isBase64Encoded: true,
  }
}

correctly returned the image for me